140778438570081 has 81 divisors (see below), whose sum is σ = 225011292106809. Its totient is φ = 84776533425792.

The previous prime is 140778438570041. The next prime is 140778438570097. The reversal of 140778438570081 is 180075834877041.

The square root of 140778438570081 is 11865009.

It is a perfect power (a square), and thus also a powerful number.

140778438570081 is a `hidden beast` number, since 1 + 4 + 0 + 7 + 78 + 438 + 57 + 0 + 0 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 63018845510481 + 77759593059600 = 7938441^2 + 8818140^2 .

It is a de Polignac number, because none of the positive numbers 2^k-140778438570081 is a prime.

It is a super-2 number, since 2×140778438570081² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (140778438570041) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 21748558261 + ... + 21748564733.

Almost surely, 2^{140778438570081} is an apocalyptic number.

140778438570081 is the 11865009-th square number.

140778438570081 is the 5932505-th centered octagonal number.

It is an amenable number.

140778438570081 is a deficient number, since it is larger than the sum of its proper divisors (84232853536728).

140778438570081 is an frugal number, since it uses more digits than its factorization.

140778438570081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13072 (or 6536 counting only the distinct ones).

The product of its (nonzero) digits is 42147840, while the sum is 63.

The spelling of 140778438570081 in words is "one hundred forty trillion, seven hundred seventy-eight billion, four hundred thirty-eight million, five hundred seventy thousand, eighty-one".